ADTRAN TSU 120, User Manual

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Chapter 1. Introduction
14
TSU 120 User Manual 61200.129L1-1
Internal Timing
The TSU 120 is the source of timing. The TSU 120 is
configured to use its own internal oscillator as the
source of timing. Applications include private line
driver circuits where one end is set to network and the
other to internal. See Figure 1-7.
The internal source timing is restricted from use when a
secondary interface is also used.
DTE
OSC
( O P T I O N )
Network
Interface
T1 XMIT
T1 Receive
( D S 1 )
Nx56/64
DTE CLOCK
DSX-1
PBX
Figure 1-7
Internal Clock Source